Granted Patent
Utility
US 5,558,683 · App. 08/407,726
Mannich base derivatives, and the production and uses thereof
Inventor:
John T. Loper
Patented Case
View Patent ↗
Granted: Sep 24, 1996
Filed: Mar 20, 1995
Inventor
John T. Loper
Assignee (at issue)
Ethyl Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.